Securing means for artificial teeth



Dec. 6, 1932. F. J. McNAMARA 1,889,756

SECURING MEANS FOR ARTIFICIAL TEETH Filed Jan. 24, 1931 T2275 7. 272m Fry. 5. I

' 'fizmk MNam Patented Dec. 6, 193 2 FRANK J. MCNAMARA, OF SEATTLE, WASI-IZENGTON SECURING MEANS Fort ARTIFICIAL TEETH- Application filed January 24, 1931. Serial No. 510,903.

My invention relates to securing means for artificial teeth and certain objects of the invention are to provide simple, efficient and natural means whereby artificial teeth are strongly and securely fastened at comparatively small cost and whereby the metal parts that are used are completely concealed. and are not in contact with any part of the mouth.

With the above and other ob]ects' in view which will appear as the description proceeds, the invention consists of the novel con struction, adaptation, combination and arrangement of parts hereinafter described and claimed. These objects are accomplished by devices illustrated in the accompanying drawing; wherein i Figure 1 is a view in front elevation showing two adjacent anterior teeth secured to a bar;

Fig. 2 is a top plan view of the same;

Fig. 3 is a view in end elevation;

Fig. L is a view in transverse vertical sec-' used equally aswell.

tion taken on a broken line 4, 4 of Fig. 2;

Fig. 5 is a view in longitudinal vertical section taken on a broken line 5, 5 of Fig. 2;: Fig. 6 is a view in perspective of a tooth that is cut and in readiness to be fastened;

Fig. 7 is a view in perspective of the split pin that forms a union between the tooth and the bar; and

Fig. 8 is a view in perspective of the metal sanitary bar.

Referring to the drawing throughout which like reference numerals indicate like parts it may be said that, in its embodiment, the invention consists essentially in a tooth, a split pin and a bar as shown in Figs. 6, 7 and 8 of the drawing respectively, and it will be understood that either one or more 49 teeth and either anterior or posterior may be secured to the bar.

The most important feature of the invention comprises a groove 5 that is cut longitudinally across the base end portion of the tooth or the end portion which is next to the gums when the tooth is fastened in place within the mouth, Said groove is out at some depth into the tooth so as to snugly receive a bar 6, known in the dental profession as a 59 sanitary bar, and it will be understood that other'bars maybeused as'the invention is 7 not confinedto this particular bar. It will be'no'ted 'that said groove and'bar are greater indepth than in thickness or width, and this,

featureserves to'retainthe'teethin the upright position when secured in themouth.

Theouter ends of the bar are secured in the mouth by any of the well known means used in the dental profession and with which this particular invention is'not' concerned.

As a bond orunion between the tooth and the bar 6 I have used a pin, known in the profession as a split pin and ordinarily employed dentists for other purposes. Said pin comprises two upstanding prongs'7 with a slot 8' therebetween that is adaptedto snugly receive the bar, an annular base plate portion 9 and a centrally depending pivot or spindle 10. While I have used-thispin it may here be remarked and expressly understood "that I do not'confinemyselftothe use of this particular pin and that otherrpins may be ing, a'cylindrical 'well 11 is cut downwardly it into thebase portion of the tooth concentric 1 with the groove 5 with a portion extending into both side walls of saidgroove and terminating. at the bottomthere'of-L Concentric with'sa'id well is'a small hole 12 extendingdown into the tooth to receive the pivot portion 10 of the split pin. The well permits the annular plate 9 of the pin to pass to the bottom of the longitudinal groove and the prongs 7 are disposed transversely of said 55 groove with the slot 8 in alignment therewith to provide a continuous channel for the bar 6. In assembling and fastening a tooth the bar 6 is placed in the slot 8 of the split pin and secured therein by means of solder or other suitable means. The pin is set into the tooth with its spindle 10 in the hole 12 and its base plate portion 9 resting on the bottom of the groove ,5. In this position the bar fits the groove snugly and, together with the split 95 pin, is fastened in place with cement or the like. Any and all interstices, such as the I space in the well 11 above the base plate, are completely filled with cement. As shown in Figs. 3, 4 and 5, the cement may completely 1199 cover the bar thus entirely eliminating contact of the metal with any part of the mouth. As shown in Figs. 1 and 2, several artificial teeth may be secured, side by side, to the bar .and interposed between the natural teeth and so shaped, fitted and secured that the bar and all metal parts are completely concealed.

It will now be apparent that I have provided securing means for artificial teeth and dental bridge-work that is'simple and comparatively inexpensive, which is strong and durable in construction, that is more natural in appearance and more comfortable to the mouth than the means heretofore employed in dental practice. Having thus described my invention, it being understood that minor changes may be resorted to in its construction and arrangenient without departing from the scope and spirit of the invention, what I claim and desire to secure by Letters Patent of the United Statesis A securing means for artificial teeth in dental bridgework having incombination a tooth with a longitudinal groove in its con-' cave base with flat side walls and whose depth is greater than its width, bar of rectangular cross Isectionfitting snugly into the groove,

said toothhaving a well in its base concentricwith the groove and extending into the side walls thereof, said well and groove havmg a small concentric hole extending into n and terminating within the tooth, a pin com- I prising a base portion with upstanding spaced apart prongs and a depending spindle, said base seated on the bottom of the well and the prongs bearing against the sides thereof and the space between the prongs aligned with the'groove, the spindle fitting snugly into the small hole, the bar fitting snugly between the prongs and soldered there- 7 to and tothe base of the pin, and cementing means for theconcave'base of the tooth covering the pin and bar. v

In testlmonyvwhereof Ivaflix my signature.

FRANK JlM NAMARA; 

